Boiler-tube cutter.



No. 864,693. PATENTED AUG. 27, 1907. C. ROOS.

` BOILER TUBE CUTTER.

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PATENTED AUG. 27, 190'7.

G. ROOS. BOILER TUBE CUTTER.

APPLIGATION FILED Nov.21. 190B.

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UNITED STATES CHARLES ROOS, OF LEADVILLE, COLORADO.

BOILER-TUBE CUTTER.

Specification of Letters Patent.

Patented Aug. 27, 1907.

Application filed November 2l, 1906. Serial No. 344,477.

To' all whom it may concern:

Be it known that l, CHARLns Roos, a citizen of the United States ofAmerica, residing at Leadville, in the county of Lake and State ofColorado, have invented new and useful Improvements in Boiler-TubeCutters, of which the following is a specification.

This invention relates to improvements in boiler tube cutters, theobject of the invention being to provide a simple construction of cutteradapted to be easily and conveniently handled and inserted within andwithdrawn from the tubes, and 'whereliiy the operation oi cutting thetubes may bc efficiently and expeditiously performed.

1n the accompanying drawings,-Figure l is a side elevation of a boilertube cutter embodying my in- Fig. 2 is a rear end elevation thereof.Fig. 3 isa vertical longitudinal section. Fig. 4 is a front elevation.Fig. 5 is a cross section on line 5-5 of Fig. l..

Referring to the drawings, the numeral l. designates a suitable frame,in which is revolubly mounted a cut- 1er head comprising a tube 2 havinga reduced forward end 3 adapted to enter the tube to be cut. The frame 1carries annular bearing rings 4, 5 and 6, which enter annular grooves inthe surface of the cutter tube 2, and on which the latter turns Arrangedwithin the reduced forward end 3 is a group of resilient cutter bars orshanks 7, each comprising a metallic strip secured at its inner end tothe wall of the cutter tube in any suitable manner, as by a bolt 8, theforwardends of said cutter bars or shanks terminating,slightly beyondthe outer end of the reduced portion i, and being free for movementtoward and from the wall of such portion. The outer or forwarduends ofthe said cutter bars or shanks carry outwardly extending right-angularlyarranged cutters 8, which lit and slide within recesses 9 formed in theedge of the portion 3 and are made integral with or suitably fixed tothe shanks. Leaf springs l0 are fixed at their inner ends to the tubesby the bolts 8 and are arranged between the shanks and wall of theportion 3, their free forward -ends being inwardly bent to exertpressure on the shanks to normally force the cutters inwardly to theirprimal or inoperative position. The cutters are arranged equidistantlyaround the portion 3 and are designed to act successively en the surfaceof the boiler tube as the cutter tube 2 rotates. A ring 11 surrounds andis suitably secured to the reduced portion 3 and serves as a to indicatethe extent to which the same should be inserted into the boiler tube.

.lhe rear end of the cutter tube 2 is provided with a threaded passage12 an d is solid to form a nut to traverse a screw 13 extending at itsrear end through said pas- This screw is threaded for the greaterportion of its length, but is provided with an angular rear eX- tremity14 projecting through a correspondingly shaped opening 15 in the rearend of the frame 1, whereby the screw is held from rotating with thecutter tube or cylinder. The forward end of the screw carries a taperedhead or spreader 1G which is revolublv mounted thereon to turn with theouter ends of the Shanks 7 which impinge against the same,l thusreducing friction inthe use of the tool. When revoluble motion in onedirection is imparted to the cutter tube 2, the latter travels forwardlyon the screw and the cutters therefor ride in contact with the taperedhead or spreader 16, by which they are progressively forced outward totheir work to a gradually increasing extent to cut into the surface ofthe boiler tube. When the cutter tube 2 is revolved in the reversedirection it travels back on the screw 13 and the shanks accordinglymove back on the reducing surface of the head 1G, and the cutters areretracted by the springs 10, thus permitting the cutting end of theimplement to be conveniently removed from the boiler tube at thecompletion of the cutting operation.

A bracket 17 is suitably secured upon one side of the frame 1 and formstherewith a bearing for a shaft 18 te which is keyed or otherwise fixeda drive gear 19 which meshes with an integral gear 20 formed upon thecutter tube 2. The outer end of the shaft 18 projects beyond the bracket17 and is squared for the application of a crank handle, brace o1' othersuitable power appliance whereby the tool may be driven. A handle 22 isprovided upon thc frame 1 at any convenient point to enable the deviceto be conveniently handled and manipulated.

From the foregoing description, taken in connection with theaccompanying drawings, the construction and inode of operation of thedevice will be readily understood, and it will be seen that theinvention provides a cutter which may be rapidly and efficientlyoperated and conveniently controlled.

1f desired, the reduced portion of the cutter tube may be independent ofthe tube and detachably scoured thereto, either by fastening it upon theinterior or fitting it into the forward end of the tube, so thatinterchangeable portions of different sizesmay be employed withoutremoving the cutting blades or shanks, and by simply varying the size ofthe spreading head to seat the diameter of the reduced fitting employed.By this means, the frame and body of the tool may be used in connectionwith. separate attachments for cutting boiler tubes of different sizes.

Having thus described the invention, what is claimed as new, isz

1. A boiler tube cutter comprising a frame, a screw lixed againstrotation relative to the frame, a cutter tube revolubly mounted on theframe and inclosingl the screw, said tube being arranged to travel onthe screw, the free end of the latter being normally arranged to projectbeyoud the forward end of' the tube, radially movable cutters upon theforward end ot' the tube having Shanks extending therein, springs actingupon said Shanks to normally retract the cutters, and a spreader mountedupon the free end ol the screw for projecting the cutters in the advancemovement of the tube thereon.

2. A boiler tube cutter comprising a frame, a cutter tube revolublymounted on the frame and havingan open forward end and a closed rearend, the latter being provided with a Screw-threaded aperture, a screwfixed against rotation relative to the frame and extending through thetube with its forward end normally projecting in advance thereof, thesaid screw being engaged with the threaded opening in the tube, wherebythe latter is adapted to travel on the screw, Shanks movably mounted inthe forward end of the tube, springs acting on said Shanks to normallyhold them inwardly, radially movable cutters carried bythe Shanks beyondthe forward end of the tube, and a spreader revolubly mounted upon theirec end of the screw to act upon the Shanks and spread tbe cutters uponthe forward movement of the tube.

2. boiler tube cutter .comprising a frame, a rotary cutter tubejournaled therein, cutters at the forward end of the tube havinglradially movable shanks inclosed therein, Springs acting upon saidShanks to retract the cutters, a screw shaft extending through thecutter tube, said shaft being fixed against rotation relative to theframe and in threaded engagement with the tube, whereby the latter isadapted to travel thereon, a tapered spreader revolubly mounted upon theShaft to project the cutters upon the forward movement of the tube, andmeans for revolving` the cutter tube.

In testimony whereof, I aflix my signature in presence of two witnesses.

CHARLES ROOS.

Witnesses HELMER Os'l'RUM, CIIAS. E. NoRDBnuG.

